题解 | #[NOIP2013]记数问题#

#include <stdio.h>

int main() {
    int n, x, cnt = 0;
    while (scanf("%d %d", &n, &x) != EOF) {
        int tmp;
        for (int i = 1; i <= n; i++) {
            tmp = i;
            while (tmp) {
                if (tmp % 10 == x) {
                    cnt++;
                }
                tmp /= 10;
            }
        }

        printf("%d\n", cnt);
    }
    return 0;
}